Stop motion for twisters



Jan. 24, 1928.

1,657,431 H. A. DAVIS STOP MOTION FOR TWISTERS Filed may 9, 1927 Fig.1.

Patented Jan. 24, 1928.

UNITED STATES 'PArEn'r orrics.

HARRY A. DAVIS, F HOE'EDALE, MASSACHUSETTS, ASSIGNOR TO DRAPER CORPORA- IIGN, GE ZEIOPEDALE, MASSACHUSETTS, A CORJZORATIGN OF MAINE.

STOP MOTION FOR. TVISTERS.

npplication filed May 9,

This invention relates to improvements in stop motions for a twister of the type in which a pivotally mounted guide is sup ported by the running yarn and is provided with a tongue which, when the yarn fails, is permitted to feed in between the rolls and thus stop the rotation of the top roll. Devices of this type have been so constructed that considerable difficulty is experienced in 0 removing the tongue when it becomes worn.

One of the objects of the invention is to provide means for supporting the tongue upon the guide in such a manner that the tongue can readily be removed and replaced 5 so that by having a number of tongues on hand, no substantial time will be lost in such removal and replacement.

A further object of the invention is to provide a device of this character which can 50 be more economically constructed and which can be readily applied to any usual type of twister.

In devices of this type it is desirable that the tongue be permitted a limited swinging movement to permit it readily to adjust itself to the bite of the rolls so that it will be fed in surely and accurately therebetween to stop the rotation of the top roll.

These and other objects and features will more fully appear from the following clescription in the accompanying drawings and will be particularly pointed out in the claims.

The drawings illustrate a simple and preferred form of the invention, together with so much of an ordinary type of twister frame as is necessary to disclose the invention.

In the drawings:

Fig. 1 is a view in vertical cross section through a portion of the twister frame taken adjacent to one of the supports of one of the top rolls and showing the stop motion device with the yarn in running posi- 4 tion.

Fig. 2 is a similar view showing the stop motion device in the position it assumes when the yarn fails.

3 is a view in front elevation of the upper portion of the construction illustrated in Fig. i.

Fig. 4: is a top plan view of a portion of the device shown in previous figures.

1927'. Serial No. 189,761.

Fig. 5 is a perspective view of a preferred form of tongue provided with a head adapted to be detach-ably secured to the guide.

In the twister frame illustrated herein, a series of supports 1 which extend upwardly from the frame 2 present bearings in which is journalled the positively driven bottom roll 3. Bars 4 which are mounted in these supports in the usual manner are provided with upwardly projecting supportingbraclrets 5 having vertically slotted bearings 6 in which are mounted the journals 7 of the top rolls 8. The top rolls are thereby pcrmitted to rest upon and to be driven by the bottom roll and also to be lifted out of contact with the bottom roll and arrested by v the stop motion hereinafter to be described.

The yarn 9 feeds down around the top roll, in between the top and bottom rolls, around the back of the bottom roll, and

thence downward through the guide eye 10 which is supported from the finger board 11 projecting atthe front of the frame 2.

A preferred form of stop motion device is provided for each top roll or run of yarn. A bracket 12 is secured by means of a bolt or set screw 13 to the front face of one of the top roll supports 5. This bracket is provided with an upwardly extending ear 1% provided with an aperture forming a bearing extending in parallelism with the axis of the top roll.

The guide 15, which preferably but not necessarily is a cylindrical wire of suitable gauge, has a laterally extending cylindrical upper end which is pivotally journalled' in this bearing. The bracket 12 desirably is provided with a lug presenting an inclined face 16 which will limit the downward movement of the guide 15 and thereby prevent the roll separating tongue from being drawn too far into the bite of the rolls. The lower free end of the guide 15 has means such as an eye or pig-tail 17 for engaging therunning yarn in such a manner that the guide will be supported thereby during the normal running of the yarn, but will be permitted to drop upon the failure of the yarn by breakage or by reason of undue slaclrness. The guide 15 is provided with an intermediate open loop which desirably is U-shaped and the legs of which extend in parallelism with the axes of the rolls. This loop is de- (iii sirahly in a suhetontiully horizontal position during the operation ot the twister, us illustruted in Fig. 1.

In the present invention the tongue is provided with u heud which may he readily :isr-enihled upon or removed from this loop portion of the guide. In the preferred construction illustrated herein the tongue 18 which desirably is of thin sheet metal is secured to :1 head 1) which may he of cost or lforp'ed .luetul end which is provided with oppositely disposed longitudinally extend inn groove:- 20 and :El adopted partially to enihrace the legs of the loop when the head is inserted therchetween. lly reason of this conslrimtion, the heard of the tongue nurv he sliduhly inserted in the open end of the loop. The guide may he mode of material of sullicient reeilience to retain the head of the tongue Within the loop. Desiruhly, l1owever. means are provided tor preventing possible displacement of the heed from the loop either lengthwise or by the separation oi the legs thereof. Any such means may be employed. A convenient and relutively simple means which is illustrated herein comprises :1 clip 22, the edges of which are curved downwardly in the some direction to hook over and embrace the legs oi? the loop, as illustrated particularly in Figs. 1., 2 and 4. This clip desirably is located adjacent to the open end of the loop. Vlhen it is desired to remove and replace a yarn tongue, the legs at the open end of the loop may he braced together sulliciently to permit the removal of the clip, whereupon the head of the tongue may he slid lengtlnvise through the open end of the loop and removed. The head of at new tongue can thereupon he in.- sertcd through the open end of the loop and the clip 22 again applied. Such removal and replacement can he done without ma terial wastage of time in the operation of the machine.

In order to give sufiicient freedom of movement to permit the tongue readily to engugejthe bite of the rolls, the grooves 20, 21 in the head may he made of such larger diameter than that of the legs of the loop as will permit the desired amount of lost motion.

It will he readily understood that different forms of head adapted to he removahly applied to and removed from the loop may he employed instead of the one illustrated herein. and that various other changes in form, construction and arrangement of parts may he made within the spirit and scene of the invention.

Having thus described the invention, what is claimed as new, and desired to be secured by Letters Patent, is:

1; In it stop motion for twisters having: top and bottom rolls and stands there-for, :i guide pivotully mounted upon the top roll stand and normally supported at its lower end by the running yarn und halving on intermediate open loop presenting nor-lowly spaced extending in parallelism with the axes oi the rolls and :1 tongue halving u heed dctuehuhly mounted upon the legs oi 'uid loop end presenting :1 free end end adopted to enter between sold rolls upon luiluro of the yarn to support 'tlll uuide.

Q. in it stop motion for lW we; having top end lln'illoni rolls und rounds tluu'el or, u guide pivolully mounted upon the top roll stand und normally supported ul its lower end hr the running yarn and lowing on intermediate open loop presenting nurrowly spuccd legs extending in purullelisni with the ones oil the rolls; end a tongue halving :i head provided with mcunn elidulile to enpage the legs of M d loop and to he dotuchuhly retained tlierch v and presenting a tree end adapted to enter lietweeu sold rolls upon tuilure ot the yarn to support said guide.

In :1. stop motion for twisters huviug top and bottom rolls and stands therefor, a guide pivolzllly uunlnted upon the top roll stand and noruuilly suppm'tcd at its lower end hy the running yurn and hurling on interinediute open loop [Jresentior; lltlll'UWl) e iuced logs extending in purullcliern with the ones of the rolls and u lxnigue having :1 head provided with o uwsltely disposed longitudinully eictlunlinu grooves to unuu o the logs oi so id loop and aulu 'itml to he slid uhly inserted therehetwcen and releasable menus tor retaining said head in said loop.

4-. .ln :1 stop motion for twistcrs having top and hottoin rolls and stands therefor, u guide pivotully nuuunled upon the lop roll stand and normally supported at its lower end by therunning yurn and huuviugr an intermediate open loop presenting narrowly SPLlCQtl. legs extending in parallelism with the axes oi. the rolls and. u tongue having :1 head provided with oppositely disposed lonp'itudinully extending grooves to enuuge the legs of said loop und adapted to he slidnhl r inserted thcrel n'rtweeu und u clip detuchuhI embracing the legs of the loop at the open end thereof.

5. In a stop motion tor twister-s having top end bottom rolls and sluuds there'lcu', u guide pivotully mounted upon the top roll stand and normally supported at its lower end by the running yarn and having on in.- teri'i'iediute open loop {n'euculing narrowly spaced legs extending in ilui'ollelisni with the axes of the rolls, a tongue of thin metal having one end secured to at block provided with oppositely disposed. longitudinally ere twirling; grooves to engage the edges o'l the legs 01 the loop and ittllllltell to he sliduhly inserted l'l1l3l'Cl36l'.\V(-l(3ll and a. sheet metal clip 'emhrncinu the lees of said loop iuljuoeut the open end thereof noting to prevent expansion ill) of said loop and to retain the head of the tongue therebetween. v

In a stop motion for a twister having top and bottom rolls and stands therefor, a guide wire pivotally mounted upon the top roll stand and supported at its lower end by the running yarn and having an intermediate U-shaped loop presenting narrowly spaced legs extending in parallelism with the axes oi the rolls, a sheet metal roll-separating tongue having a head comprising a block provided with longitudinal grooves of greater diameterthan the diameter of the legs ot the loop siidabiy inserted between said legs with the grooves thereof engaging said legs adapted to permit limited swinging movement of said tongue whereby the free end thereof will properly enter between the rolls upon the failure of the yarn to support the said guide and means for retainlng said head 1n said loop.

7. A stop motion for twisters' comprising a single Wire guide having one end bent latera-11y to provide a journal adapted to be pivotally mounted upon the top roll stand of the twister and having means at its lower end to engage the running yarn and an interme diate laterally extending U-shaped loop, a roll-separating tongue having a head provided with longitudinally extending grooves slidably engaging the legs of said loop and means for preventing separation of the legs of the loop.

In testimony whereof, I have signed my name to this specification.

HARRY A. DAVIS. 

